<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source to the Rust file `libcore/array.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>array.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../core/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span> <span id="2"> 2</span> <span id="3"> 3</span> <span id="4"> 4</span> <span id="5"> 5</span> <span id="6"> 6</span> <span id="7"> 7</span> <span id="8"> 8</span> <span id="9"> 9</span> <span id="10"> 10</span> <span id="11"> 11</span> <span id="12"> 12</span> <span id="13"> 13</span> <span id="14"> 14</span> <span id="15"> 15</span> <span id="16"> 16</span> <span id="17"> 17</span> <span id="18"> 18</span> <span id="19"> 19</span> <span id="20"> 20</span> <span id="21"> 21</span> <span id="22"> 22</span> <span id="23"> 23</span> <span id="24"> 24</span> <span id="25"> 25</span> <span id="26"> 26</span> <span id="27"> 27</span> <span id="28"> 28</span> <span id="29"> 29</span> <span id="30"> 30</span> <span id="31"> 31</span> <span id="32"> 32</span> <span id="33"> 33</span> <span id="34"> 34</span> <span id="35"> 35</span> <span id="36"> 36</span> <span id="37"> 37</span> <span id="38"> 38</span> <span id="39"> 39</span> <span id="40"> 40</span> <span id="41"> 41</span> <span id="42"> 42</span> <span id="43"> 43</span> <span id="44"> 44</span> <span id="45"> 45</span> <span id="46"> 46</span> <span id="47"> 47</span> <span id="48"> 48</span> <span id="49"> 49</span> <span id="50"> 50</span> <span id="51"> 51</span> <span id="52"> 52</span> <span id="53"> 53</span> <span id="54"> 54</span> <span id="55"> 55</span> <span id="56"> 56</span> <span id="57"> 57</span> <span id="58"> 58</span> <span id="59"> 59</span> <span id="60"> 60</span> <span id="61"> 61</span> <span id="62"> 62</span> <span id="63"> 63</span> <span id="64"> 64</span> <span id="65"> 65</span> <span id="66"> 66</span> <span id="67"> 67</span> <span id="68"> 68</span> <span id="69"> 69</span> <span id="70"> 70</span> <span id="71"> 71</span> <span id="72"> 72</span> <span id="73"> 73</span> <span id="74"> 74</span> <span id="75"> 75</span> <span id="76"> 76</span> <span id="77"> 77</span> <span id="78"> 78</span> <span id="79"> 79</span> <span id="80"> 80</span> <span id="81"> 81</span> <span id="82"> 82</span> <span id="83"> 83</span> <span id="84"> 84</span> <span id="85"> 85</span> <span id="86"> 86</span> <span id="87"> 87</span> <span id="88"> 88</span> <span id="89"> 89</span> <span id="90"> 90</span> <span id="91"> 91</span> <span id="92"> 92</span> <span id="93"> 93</span> <span id="94"> 94</span> <span id="95"> 95</span> <span id="96"> 96</span> <span id="97"> 97</span> <span id="98"> 98</span> <span id="99"> 99</span> <span id="100">100</span> <span id="101">101</span> <span id="102">102</span> <span id="103">103</span> <span id="104">104</span> <span id="105">105</span> <span id="106">106</span> <span id="107">107</span> <span id="108">108</span> <span id="109">109</span> <span id="110">110</span> <span id="111">111</span> <span id="112">112</span> <span id="113">113</span> <span id="114">114</span> <span id="115">115</span> <span id="116">116</span> <span id="117">117</span> <span id="118">118</span> <span id="119">119</span> <span id="120">120</span> <span id="121">121</span> <span id="122">122</span> <span id="123">123</span> <span id="124">124</span> <span id="125">125</span> <span id="126">126</span> <span id="127">127</span> <span id="128">128</span> <span id="129">129</span> <span id="130">130</span> <span id="131">131</span> <span id="132">132</span> <span id="133">133</span> <span id="134">134</span> <span id="135">135</span> <span id="136">136</span> <span id="137">137</span> <span id="138">138</span> <span id="139">139</span> <span id="140">140</span> <span id="141">141</span> <span id="142">142</span> <span id="143">143</span> <span id="144">144</span> <span id="145">145</span> <span id="146">146</span> <span id="147">147</span> <span id="148">148</span> <span id="149">149</span> <span id="150">150</span> <span id="151">151</span> <span id="152">152</span> <span id="153">153</span> <span id="154">154</span> <span id="155">155</span> <span id="156">156</span> <span id="157">157</span> <span id="158">158</span> <span id="159">159</span> <span id="160">160</span> <span id="161">161</span> <span id="162">162</span> <span id="163">163</span> <span id="164">164</span> <span id="165">165</span> <span id="166">166</span> <span id="167">167</span> <span id="168">168</span> <span id="169">169</span> <span id="170">170</span> <span id="171">171</span> <span id="172">172</span> <span id="173">173</span> <span id="174">174</span> <span id="175">175</span> <span id="176">176</span> <span id="177">177</span> <span id="178">178</span> <span id="179">179</span> <span id="180">180</span> <span id="181">181</span> <span id="182">182</span> <span id="183">183</span> <span id="184">184</span> <span id="185">185</span> <span id="186">186</span> <span id="187">187</span> <span id="188">188</span> <span id="189">189</span> <span id="190">190</span> <span id="191">191</span> <span id="192">192</span> <span id="193">193</span> <span id="194">194</span> <span id="195">195</span> <span id="196">196</span> <span id="197">197</span> <span id="198">198</span> <span id="199">199</span> <span id="200">200</span> <span id="201">201</span> <span id="202">202</span> <span id="203">203</span> <span id="204">204</span> <span id="205">205</span> <span id="206">206</span> <span id="207">207</span> <span id="208">208</span> <span id="209">209</span> <span id="210">210</span> <span id="211">211</span> <span id="212">212</span> <span id="213">213</span> <span id="214">214</span> <span id="215">215</span> <span id="216">216</span> <span id="217">217</span> <span id="218">218</span> <span id="219">219</span> <span id="220">220</span> <span id="221">221</span> <span id="222">222</span> <span id="223">223</span> <span id="224">224</span> <span id="225">225</span> <span id="226">226</span> <span id="227">227</span> <span id="228">228</span> <span id="229">229</span> <span id="230">230</span> <span id="231">231</span> <span id="232">232</span> <span id="233">233</span> <span id="234">234</span> <span id="235">235</span> <span id="236">236</span> <span id="237">237</span> <span id="238">238</span> <span id="239">239</span> <span id="240">240</span> <span id="241">241</span> <span id="242">242</span> <span id="243">243</span> <span id="244">244</span> <span id="245">245</span> <span id="246">246</span> <span id="247">247</span> <span id="248">248</span> <span id="249">249</span> <span id="250">250</span> <span id="251">251</span> <span id="252">252</span> <span id="253">253</span> <span id="254">254</span> <span id="255">255</span> <span id="256">256</span> <span id="257">257</span> <span id="258">258</span> <span id="259">259</span> <span id="260">260</span> <span id="261">261</span> <span id="262">262</span> <span id="263">263</span> <span id="264">264</span> <span id="265">265</span> <span id="266">266</span> <span id="267">267</span> <span id="268">268</span> <span id="269">269</span> <span id="270">270</span> <span id="271">271</span> <span id="272">272</span> <span id="273">273</span> <span id="274">274</span> <span id="275">275</span> <span id="276">276</span> <span id="277">277</span> <span id="278">278</span> <span id="279">279</span> <span id="280">280</span> <span id="281">281</span> <span id="282">282</span> <span id="283">283</span> <span id="284">284</span> <span id="285">285</span> <span id="286">286</span> <span id="287">287</span> </pre><pre class="rust "> <span class="comment">// Copyright 2014 The Rust Project Developers. See the COPYRIGHT</span> <span class="comment">// file at the top-level directory of this distribution and at</span> <span class="comment">// http://rust-lang.org/COPYRIGHT.</span> <span class="comment">//</span> <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> <span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span> <span class="comment">// option. This file may not be copied, modified, or distributed</span> <span class="comment">// except according to those terms.</span> <span class="doccomment">//! Implementations of things like `Eq` for fixed-length arrays</span> <span class="doccomment">//! up to a certain length. Eventually we should able to generalize</span> <span class="doccomment">//! to all lengths.</span> <span class="doccomment">//!</span> <span class="doccomment">//! *[See also the array primitive type](../../std/primitive.array.html).*</span> <span class="attribute">#![<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fixed_size_array"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"traits and impls are better expressed through generic \ integer constants"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27778"</span>)]</span> <span class="kw">use</span> <span class="ident">borrow</span>::{<span class="ident">Borrow</span>, <span class="ident">BorrowMut</span>}; <span class="kw">use</span> <span class="ident">cmp</span>::<span class="ident">Ordering</span>; <span class="kw">use</span> <span class="ident">convert</span>::<span class="ident">TryFrom</span>; <span class="kw">use</span> <span class="ident">fmt</span>; <span class="kw">use</span> <span class="ident">hash</span>::{<span class="ident">Hash</span>, <span class="self">self</span>}; <span class="kw">use</span> <span class="ident">marker</span>::<span class="ident">Unsize</span>; <span class="kw">use</span> <span class="ident">slice</span>::{<span class="ident">Iter</span>, <span class="ident">IterMut</span>}; <span class="doccomment">/// Utility trait implemented only on arrays of fixed size</span> <span class="doccomment">///</span> <span class="doccomment">/// This trait can be used to implement other traits on fixed-size arrays</span> <span class="doccomment">/// without causing much metadata bloat.</span> <span class="doccomment">///</span> <span class="doccomment">/// The trait is marked unsafe in order to restrict implementors to fixed-size</span> <span class="doccomment">/// arrays. User of this trait can assume that implementors have the exact</span> <span class="doccomment">/// layout in memory of a fixed size array (for example, for unsafe</span> <span class="doccomment">/// initialization).</span> <span class="doccomment">///</span> <span class="doccomment">/// Note that the traits AsRef and AsMut provide similar methods for types that</span> <span class="doccomment">/// may not be fixed-size arrays. Implementors should prefer those traits</span> <span class="doccomment">/// instead.</span> <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">trait</span> <span class="ident">FixedSizeArray</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="doccomment">/// Converts the array to immutable slice</span> <span class="kw">fn</span> <span class="ident">as_slice</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>]; <span class="doccomment">/// Converts the array to mutable slice</span> <span class="kw">fn</span> <span class="ident">as_mut_slice</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]; } <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">A</span>: <span class="ident">Unsize</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">>></span> <span class="ident">FixedSizeArray</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">A</span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">as_slice</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { <span class="self">self</span> } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">as_mut_slice</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="self">self</span> } } <span class="doccomment">/// The error type returned when a conversion from a slice to an array fails.</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"try_from"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"33417"</span>)]</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Copy</span>, <span class="ident">Clone</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">TryFromSliceError</span>(()); <span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">TryFromSliceError</span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">fmt</span>::<span class="ident">Display</span>::<span class="ident">fmt</span>(<span class="self">self</span>.<span class="ident">__description</span>(), <span class="ident">f</span>) } } <span class="kw">impl</span> <span class="ident">TryFromSliceError</span> { <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"array_error_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"available through Error trait and this method should not \ be exposed publicly"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">__description</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">str</span> { <span class="string">"could not convert slice to array"</span> } } <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">__impl_slice_eq1</span> { (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span>: <span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>: <span class="ident">ty</span>) <span class="op">=></span> { <span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>, <span class="ident">Sized</span> } }; (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span>: <span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>: <span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Bound</span>: <span class="ident">ident</span>) <span class="op">=></span> { <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="ident">A</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Bound</span>, <span class="ident">B</span><span class="op">></span> <span class="ident">PartialEq</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span><span class="op">></span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span> <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">B</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>[..] <span class="op">==</span> <span class="ident">other</span>[..] } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">ne</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>[..] <span class="op">!=</span> <span class="ident">other</span>[..] } } } } <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">__impl_slice_eq2</span> { (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span>: <span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>: <span class="ident">ty</span>) <span class="op">=></span> { <span class="macro">__impl_slice_eq2</span><span class="macro">!</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>, <span class="ident">Sized</span> } }; (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span>: <span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>: <span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Bound</span>: <span class="ident">ident</span>) <span class="op">=></span> { <span class="macro">__impl_slice_eq1</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Bound</span>); <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="ident">A</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Bound</span>, <span class="ident">B</span><span class="op">></span> <span class="ident">PartialEq</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span><span class="op">></span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span> <span class="kw">where</span> <span class="ident">B</span>: <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>[..] <span class="op">==</span> <span class="ident">other</span>[..] } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">ne</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>[..] <span class="op">!=</span> <span class="ident">other</span>[..] } } } } <span class="comment">// macro for implementing n-element array functions and operations</span> <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">array_impls</span> { ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>:<span class="ident">expr</span>)<span class="op">+</span>) <span class="op">=></span> { $( <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">AsRef</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { <span class="kw-2">&</span><span class="self">self</span>[..] } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">AsMut</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">as_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>[..] } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"array_borrow"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.4.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Borrow</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] { <span class="kw">fn</span> <span class="ident">borrow</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { <span class="self">self</span> } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"array_borrow"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.4.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">BorrowMut</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] { <span class="kw">fn</span> <span class="ident">borrow_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="self">self</span> } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"try_from"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"33417"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">TryFrom</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] { <span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">TryFromSliceError</span>; <span class="kw">fn</span> <span class="ident">try_from</span>(<span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>], <span class="ident">TryFromSliceError</span><span class="op">></span> { <span class="kw">if</span> <span class="ident">slice</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span> { <span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">slice</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>]; <span class="kw">unsafe</span> { <span class="prelude-val">Ok</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">ptr</span>) } } <span class="kw">else</span> { <span class="prelude-val">Err</span>(<span class="ident">TryFromSliceError</span>(())) } } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"try_from"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"33417"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">TryFrom</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] { <span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">TryFromSliceError</span>; <span class="kw">fn</span> <span class="ident">try_from</span>(<span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>], <span class="ident">TryFromSliceError</span><span class="op">></span> { <span class="kw">if</span> <span class="ident">slice</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span> { <span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">slice</span>.<span class="ident">as_mut_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>]; <span class="kw">unsafe</span> { <span class="prelude-val">Ok</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">ptr</span>) } } <span class="kw">else</span> { <span class="prelude-val">Err</span>(<span class="ident">TryFromSliceError</span>(())) } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Hash</span><span class="op">></span> <span class="ident">Hash</span> <span class="kw">for</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] { <span class="kw">fn</span> <span class="ident">hash</span><span class="op"><</span><span class="ident">H</span>: <span class="ident">hash</span>::<span class="ident">Hasher</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">state</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">H</span>) { <span class="ident">Hash</span>::<span class="ident">hash</span>(<span class="kw-2">&</span><span class="self">self</span>[..], <span class="ident">state</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">fmt</span>::<span class="ident">Debug</span>::<span class="ident">fmt</span>(<span class="op">&&</span><span class="self">self</span>[..], <span class="ident">f</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>; <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>; <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span>; <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>; <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter_mut</span>() } } <span class="comment">// NOTE: some less important impls are omitted to reduce code bloat</span> <span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { [<span class="ident">A</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>], [<span class="ident">B</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] } <span class="macro">__impl_slice_eq2</span><span class="macro">!</span> { [<span class="ident">A</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>], [<span class="ident">B</span>] } <span class="macro">__impl_slice_eq2</span><span class="macro">!</span> { [<span class="ident">A</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>], <span class="kw-2">&</span><span class="lifetime">'b</span> [<span class="ident">B</span>] } <span class="macro">__impl_slice_eq2</span><span class="macro">!</span> { [<span class="ident">A</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>], <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> [<span class="ident">B</span>] } <span class="comment">// __impl_slice_eq2! { [A; $N], &'b [B; $N] }</span> <span class="comment">// __impl_slice_eq2! { [A; $N], &'b mut [B; $N] }</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>:<span class="ident">Eq</span><span class="op">></span> <span class="ident">Eq</span> <span class="kw">for</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] { } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>:<span class="ident">PartialOrd</span><span class="op">></span> <span class="ident">PartialOrd</span> <span class="kw">for</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Ordering</span><span class="op">></span> { <span class="ident">PartialOrd</span>::<span class="ident">partial_cmp</span>(<span class="op">&&</span><span class="self">self</span>[..], <span class="op">&&</span><span class="ident">other</span>[..]) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">lt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>]) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">PartialOrd</span>::<span class="ident">lt</span>(<span class="op">&&</span><span class="self">self</span>[..], <span class="op">&&</span><span class="ident">other</span>[..]) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">le</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>]) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">PartialOrd</span>::<span class="ident">le</span>(<span class="op">&&</span><span class="self">self</span>[..], <span class="op">&&</span><span class="ident">other</span>[..]) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">ge</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>]) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">PartialOrd</span>::<span class="ident">ge</span>(<span class="op">&&</span><span class="self">self</span>[..], <span class="op">&&</span><span class="ident">other</span>[..]) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">gt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>]) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">PartialOrd</span>::<span class="ident">gt</span>(<span class="op">&&</span><span class="self">self</span>[..], <span class="op">&&</span><span class="ident">other</span>[..]) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>:<span class="ident">Ord</span><span class="op">></span> <span class="ident">Ord</span> <span class="kw">for</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>]) <span class="op">-></span> <span class="ident">Ordering</span> { <span class="ident">Ord</span>::<span class="ident">cmp</span>(<span class="op">&&</span><span class="self">self</span>[..], <span class="op">&&</span><span class="ident">other</span>[..]) } } )<span class="op">+</span> } } <span class="macro">array_impls</span><span class="macro">!</span> { <span class="number">0</span> <span class="number">1</span> <span class="number">2</span> <span class="number">3</span> <span class="number">4</span> <span class="number">5</span> <span class="number">6</span> <span class="number">7</span> <span class="number">8</span> <span class="number">9</span> <span class="number">10</span> <span class="number">11</span> <span class="number">12</span> <span class="number">13</span> <span class="number">14</span> <span class="number">15</span> <span class="number">16</span> <span class="number">17</span> <span class="number">18</span> <span class="number">19</span> <span class="number">20</span> <span class="number">21</span> <span class="number">22</span> <span class="number">23</span> <span class="number">24</span> <span class="number">25</span> <span class="number">26</span> <span class="number">27</span> <span class="number">28</span> <span class="number">29</span> <span class="number">30</span> <span class="number">31</span> <span class="number">32</span> } <span class="comment">// The Default impls cannot be generated using the array_impls! macro because</span> <span class="comment">// they require array literals.</span> <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">array_impl_default</span> { {<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ident</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ts</span>:<span class="ident">ident</span>)<span class="kw-2">*</span>} <span class="op">=></span> { <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">since</span> <span class="op">=</span> <span class="string">"1.4.0"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"array_default"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>] <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Default</span> { <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>] { [<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>::<span class="ident">default</span>(), $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ts</span>::<span class="ident">default</span>()),<span class="kw-2">*</span>] } } <span class="macro">array_impl_default</span><span class="macro">!</span>{(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span> <span class="op">-</span> <span class="number">1</span>), $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ts</span>)<span class="kw-2">*</span>} }; {<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>:<span class="ident">expr</span>,} <span class="op">=></span> { <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">since</span> <span class="op">=</span> <span class="string">"1.4.0"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"array_default"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>] { <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>] { [] } } }; } <span class="macro">array_impl_default</span><span class="macro">!</span>{<span class="number">32</span>, <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span> <span class="ident">T</span>} </pre> </section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g. <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g. <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../../";window.currentCrate = "core";</script><script src="../../aliases.js"></script><script src="../../main.js"></script><script defer src="../../search-index.js"></script></body></html>